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Updated: May 1, 2025
"At length," as he himself remarks, "sparing neither labour nor expense," he constructed an instrument so excellent, that it bore a magnifying power of more than thirty times. The first celestial object to which Galileo applied his telescope was the moon, which, to use his own words, appeared as near as if it had been distant only two semidiameters of the earth.
This tacitly gave us to understand that seven semidiameters are in geometrical proportion, compass, and distance somewhat less than the circumference of a circle, from the figure of which they are extracted; that is to say, three whole parts, with an eighth and a half, a little more, or a seventh and a half, a little less, according to the instructions given us of old by Euclid, Aristotle, Archimedes, and others.
On this account, I delineated the figures of many of these new constellations, especially of the largest, and took their declinations on the tracks which they describe around the south pole, together with the measurement of the diameters and semidiameters of their tracks, as shall be found in the history of my four voyages which I am preparing for publication.
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